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Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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Connecting Pi-Zero W to Adafruit Powerboost 1000 through Extension Header or USB

As the title states I want to power my pi-zero with an adafruit powerboost 1000. I have looked into ways to do this and it seems there are 2 possibilities: Use the USB output of the powerboost to ...
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When is the RPi safe to power down? [duplicate]

My RPi3B+ is an embedded front end for a scientific instrument. I have an interface PCB with a 3amp 5v regulator, driven by a 48v supply. I monitor the 48v with ADC polled each 100ms, then sudo ...
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28 views

Safely connect Adafruit's powerboost 1000C LBO to rPi-GPIO

I would like to connect Adafruit's powerboost 1000C LBO control pin to a rPi GPIO-pin. So I can gracefully shutdown my rPi when the LiPo runs low. I would like to connect the LBO to a diode to lower ...
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can low power be the cause of low WiFi speed?

I'm using a raspberry pi 2 model b running Ubuntu core, and a TP-Link TL-WN821Nv3 USB WiFi adapter, which has a maximum speed of 300mbps/37.5mBps, and a Samsung charger which supplies 2A (lower than ...
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742 views

Power LED from 3.3V Power Pin without Resistor

I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is ...
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30 views

measuring phase difference in 3 phase power

For my ceramics oven I had 3 phase power installed. But power consumption according to the meter is way higher than the nominal 7KW the oven consumes. A friend told me that if the phase (or sinus) is ...
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43 views

Connecting 4 WiFi USB Adapters to Raspberry Pi 3

I'm trying to get 4 Wifi adapters running off the Pi (overkill I know), the adapter in question is the Alfa Network AWUS036NHA, the Pi runs smoothly and reads the adapters as I plug them in one by one ...
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31 views

Raspberry Pi Shows Low Power Lightning Bolt When Only Using 1 of 3 Amps

My Raspberry Pi 3B+ is running Kali Linux on the official 7" display. I am using an Anker power bank that says: "5V=6A (3A max per port)" in the description. When using the Pi, it constantly shows the ...
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21 views

Raspberry Shut down After trying to connect fan

I just bought a new Raspberry Pi 3B+ UK and was working with it for about 2 hours, and then when I was not at home, my son noticed that the CPU is hot and tried to cool it down with a normal 5V PC fan ...
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13 views

Reflective IR sensor Is not as sensitive as its designed to be

I'm working on a project where I'm repurposing sensors from a Pop-a-shot machine Sensors we're using https://www.popashot.net/shop/accessories/scoring-sensors/ The sensors are a 4 pin reflective IR ...
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2answers
67 views

Shorted 3.3v + 5v together. Is it possible to repair?

I was reading through some instructions on how to add a power off/on button to the Pi and accidentally misread instructions and shorted the two end pins on a 3+B model, which appear to be 3.3v and 5v. ...
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1answer
21 views

RPI3 WiFi connection is established only when connected to the access point with a LAN cable

I can successfully connect to my RPI using SSH when the RPI is connected to a wireless access point and powered by a Xiaomi battery; but I cannot when I pull off the power and plug in the socket & ...
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1answer
49 views

Do I need powered USB hub for WD External Drive?

I just got a WD MyPassport external drive, that is solely powered via USB (there are no other plugs). I have seen in various places that a powered USB port is suggested for the RPi, but I can't quite ...
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49 views

Control 12V motor from 3.3V GPIO with external 12V Power Supply

I have a 12V motor, which I need to control from my Raspberry Pi (through the RaspiRobot Board). However, the RaspiRobot Board gives me only 3.3V for the motor. At the same time, I have a 12V adapter ...
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2answers
69 views

Only red light, broken?

Last week I've bought a Raspberry pi3 b+ for my project. Today I've accidentally connected the 5v pin and the other 5v pin or with the 3v and then it has just shutdown. This time it wont boot, only ...
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24 views

Long term screw terminal power

Okay so I have a PCA9685 hooked up to a raspberry pi 3 so that it can control multiple servos via a c++ program. Currently, I have them hooked up to a battery pack that has red and black wires as gnd ...
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32 views

Connecting Raspberry Pi to old found TFT display

I have an old car DVD player sitting around that has a fairly decent secondary TFT LCD screen (hannstar 721h440b19-a1) that I thought I could use with my Raspberry Pi 3 Model B. I opened up the unit,...
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1answer
31 views

LiPo Voltage Drops

I am experiencing voltage drops with the following setup and I hope someone with mad electronics skills can explain my mistake to me: Raspberry Pi 3 Model B TFP401 Display Driver 7.0 Inch TFT Display ...
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1answer
42 views

Power indication

I have build a musicbox with an rpi 3+ and added a power button and 2 buttons to turn the volume up and down. The buttons have LED lighting, I have connected them to GPIO pins but this results in ...
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2answers
401 views

Car Powered Raspberry Pi: Safe Shutdown and Power On

Apologies if this is a duplicate, but I can't seem to find a suitable solution. I need to power a Raspberry Pi in a car, and for obvious reasons need to shutdown gracefully, however, I need it to ...
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44 views

All files lost during long shelf time

i was using my raspberry pi 3 over ssh and doing a bunch of scripts, cron jobs, etc. then i stopped for a bit and shifted my focus elsewhere and my pi remained unplugged on my desk for a few months. ...
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1answer
32 views

Raspberry Pi 2 power consumption incorrectly

Before, i'd a problem about changing governor for my Pi (cpu always stays at 600Mhz in every mode), after doing some tweaking, i'd already make it up to 900Mhz. However, now i'm using a power-meter to ...
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2answers
62 views

How to know if Raspberry is running

I'd like to implement an electronic circuit to be able to restart my raspberry Pi when it has been shutdown (without plugging in and out the USB charger, which will obviously remain plugged all the ...
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52 views

“Performance” gorvernor doesn't change cpu frequency

When i tried to change the default governor of my Raspberry Pi 2 (currently at Powersave mode) to Performance mode which is expected to push my Pi's CPU freq up to its maximum number (900Mhz) by using ...
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1answer
35 views

Don't start Pi on power connection

I've currently got my raspberry pi setup with a power switch that wakes it up from power off (using GPIO3) and shuts it down safely using a simple python script. Pretty basic stuff. The problem ...
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1answer
31 views

Computing power and memory for regression analysis

Does raspberry pi 3 have enough computing power and memory to perform regression analysis?I am making a Coordinate measuring machine prototype for my final year project and I need to perform linear ...
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2answers
75 views

How best to power a motor hat asking for 6-12V for just two DC motors

I purchased a Waveshare Motor Hat because it has the nice Pi Zero size, extra long headers, and already has headers and blocks soldered, all for less than $13. https://www.waveshare.com/motor-driver-...
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0answers
22 views

L293B unable to deliver power to dc motors on Raspberry Pi 3B+

I have a problem delivering power to 2 dc motors using L293B on Raspberry Pi3B+ I run the following code: GPIO.setmode(GPIO.BOARD) GPIO.setup(11, GPIO.OUT)#To L239 Pin2 GPIO.setup(12, GPIO.OUT) #To ...
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1answer
188 views

GPIO solution to power Pi [closed]

Looking for a GPIO solution to power a Pi 3 B+. Basically, trying to bypass the Pi micro USB connector. Also, any suggestions on hardware to build a compact, inverted, USB male right-angle ribbon ...
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2answers
641 views

Raspberry Pi with USB 3 (or 3.1) and enough power to use 2 drives

I bought a new camera which writes a lot of data onto SSDs, which I then would like to transfer onto HDDs. I thought about using a Raspberry Pi, but I was told it doesn't have enough power for a ssd ...
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1answer
97 views

Lipo power: Powerboost versus Micro-Lipo charger

I'm a hardware newbie, wanting to power my RPi Zero via a Lipo battery, and also have the battery charge without removing it. There are many posts about this, but my question is more about two power ...
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2answers
420 views

Driving an 8 Ohm, 0.25 W speaker using GPIO or audio output (RPi 1 Model B)

I'm trying to build a Raspberry Pi into an old toy phone and use the GPIO pins to read the numeric pad (this part is working) and attaching the RPi's output to the built-in speaker. The speaker says "...
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2answers
451 views

USB Hub suitable for powering a RPi 3 b+ and multiple usb sticks? [closed]

I was wondering if it was possible to power a raspberry pi 3 b+ and a dozen usb 3.0 sticks, or if not, what would be the best recommended way to go about this, ideally i'm looking for an off the shelf ...
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1answer
168 views

Can I give power 5V 2.1A to Raspberry Pi 3 B+?

I have already taken RPI 3 B + from post office and now I want start RPI 3 B +. But I'm seeing that I haven't got 5V 2.5A Power Block. So, I have a question. Can I give power 5V 2.1A to Raspberry Pi 3 ...
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2answers
657 views

read only Raspbian and microSD partitioning

is it true that if I set Raspbian as read only I can prevent any microSD corruption due to power faults, so that I can simply unplug the battery instead of the clean "Menu > Shutdown"? if it is true ...
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1answer
46 views

Is it safe to power pi 3 via gpio via ttl cable?

I hope my question makes sense. I just pruchased a dsd-tech usb to ttl adapter (cp2102 based). It has 3.3v and 5v pins. Is it safe to use the 5 pin to power my pi3 or should i go through micro usb as ...
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1answer
196 views

Detecting when a UPS kicks in

So, this is probably a matter of buying the right UPS but I am currently using a Pi to control my aquarium via relays. I'd like to hook the whole system to a UPS in case of powerloss. Ideally, I'd ...
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62 views

Can I program my Pi to keep track of its own power usage?

I'm doing a university project using a raspberry pi 3 using , and I'm essentially making a time lapse camera. I have the camera module, and I've managed to take some pictures, but it would be good for ...
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1answer
51 views

Pi Power Distribution - how much needed

I was using my Pi (1 model B+) in order to create a remote controlled car (Another question I have about that I posted). The issue is that when I connected the 9v battery to power my wheels, it ...
0
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1answer
43 views

Power from Pi 3 to 7" display

Does the 3v3 carried in the FFC cable at the display header of the Pi 3 B+ supply power to the 7" touch display? Or do I need to supply power at J1.1 and .5? If so this power can be pulled from the ...
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2answers
34 views

When under load, the system is unresponsive except for a ping

I've got a Raspberry Pi 1 Model B that has been my trusty workhorse for a few years. It normally chugs away happily running transmission, pi-hole and a node.js app simultaneously. All of a sudden it'...
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2answers
82 views

Restore UART pins 8 & 10 after GPIO.cleanup() without reboot

A Raspberry Pi 3B+ is talking to an STM32 chip via UART over pins 8 (TXD) & 10 (RXD). When I take control of those pins using GPIO.setup(8, GPIO.OUTPUT); GPIO.output(8, GPIO.LOW); and later ...
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1answer
82 views

Pi 3 and SainSmart 8 channel SSR - Not able to turn on all 8 relays

Pi 3 and SainSmart 8 channel SSR - Not able to turn on all 8 relays Environment: Raspberry Pi 3 OS: Raspian Language: Python3 and Java/Pi4J Control: SainSmart 8 channel Solid State Relay Issue: ...
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Is splitting a wire off of a single 5V pin the same as using two 5V pins? [duplicate]

In other words, is two 5V pins plugged into two pins on another device (say a 16x2 LCD display) different or the same as using one 5V pin on the pi and splitting it to two pins on the LCD? For more ...
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233 views

Is it safe to use this battery with the Raspberry Pi Zero?

I have two questions actually: 1) is it safe to use this battery and these wires with the raspberry pi zero? 2) if yes, where do i solder the highlighted (red square) ends to the zero board?
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Automatically restart Raspberry Pi on Shutdown

I'm currently using a Raspberry Pi 3 B+ at a remote location and use a VPN and SSH to access the device. If the power unexpectedly goes out at this remote location (or more commonly I stupidly ...
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1answer
241 views

Is it possible to power a 3b+ and the display with the poe hat?

For a project I would like to power the 3b+ and the official 7” touch display using the official POE hat. I figured that I could connect the display board to the pi via the jumper wires to 5v and GND ...
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2answers
257 views

Powering Raspberry Pi 3 + Official Display with anker switch power bank

There are a ton of questions posted similar to this but not quite this from what I had found, and I'm looking to understand this a bit more. I have a Raspberry Pi 3 as well as the official 7" display....
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2answers
115 views

Can I power a raspberry pi and motor hat from the same source?

I have a raspberry pi 3 and an Adafruit motor hat. The motor hat is powered from a 24v wall plug adapter while the pi is powered from a 5v one. I'd like to save a wall outlet and cleanup the wires (...
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1answer
434 views

Raspberry Pi with 12V solenoid and 5V relay module

I want to connect and control a 12V door lock solenoid and am a bit unsure about the circuit. So far I've bought following components in: Raspberry Pi 3 Model B 4x18650 Battery Holder 4x18650 (3.7V)...